Mazda released some partial photos of its re-engineered and redesigned 2014 Mazda6 today before its official debut late next month at the Moscow International Automobile Salon. The new midsize sedan will be the second Mazda to incorporate Skyactiv technology, which is an engineering platform for fuel efficiency, performance and design. The new CX-5 compact crossover was the first Mazda to use Skyactiv engineering.

The Mazda6 on view at the show will be a Russian-specification model, Mazda said, with a 2.0-liter four-cylinder engine and six-speed automatic transmission (the same powertrain available in the CX-5). It also debuts what Mazda calls “i-ELOOP,” a capacitor-based regenerative braking system, which in stop-and-go traffic will improve fuel economy by up to 10- percent, the company said in a release.

The capacitor temporarily stores large volumes of electricity that can be charged and discharged rapidly, Mazda says, and unlike batteries the capacitor isn’t prone to deterioration through repeated use. 'i-ELOOP' – "Intelligent Energy Loop" – converts the vehicle's kinetic energy into electricity as it decelerates, and uses the stored electricity to power the climate control, audio system and numerous other electrical components including for the engine and transmission.

Mazda will release more information Aug. 29 and it will show the full Mazda6 line at the Paris Motor Show in September.

Sources say the U.S. Mazda6 base model will have a 2.5-liter, direct injection four-cylinder engine and six-speed manual transmission.